This paper considers unsteady MHD free convection flows of alumina (Al2O3)-water and single-walled carbon nanotube (SWCNT)-water nanofluids within a symmetrical wavy trapezoidal enclosure. Initially, the fluid within the enclosure has a constant cold temperature and is at rest. The temperature of the wavy bottom wall is suddenly raised to a constant hot temperature, while the top wall is thermally insulated. The temperature of the side walls is maintained at the initial cold temperature. The dimensionless governing equations with the corresponding initial and boundary conditions are solved using the mixed finite element method with polynomial pressure projection stabilization. The effects of Rayleigh number Ra and Hartmann number Ha on the nanofluid flow and heat transfer are investigated. © 2016 Elsevier Ltd

Rushi Kumar B

Department of Mathematics

School of Advanced Sciences

Vellore Campus

Sivaraj R

Job V.M

Gunakala S.R

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Applied Thermal Engineering

Purpose: The purpose of this paper is to provide an insight into the influence of gyrotactic microorganisms and Hall effect on the boundary layer flow of 29 nm CuO-water mixture on the upper pointed surface of a rocket, over the bonnet of a car and upper pointed surface of an aircraft. This is true since all these objects are examples of an object with variable thickness. Design/methodology/approach: The simplification of Rosseland approximation (Taylor series expansion of T4 about T∞) is avoided; thus, two different parameters relating to the study of nonlinear thermal radiation are obtained. The governing equation is non-dimensionalized, parameterized and solved numerically. Findings: Maximum vertical and horizontal velocities of the 29 nm CuO-water nanofluid flow is guaranteed at a small value of Peclet number and large value of buoyancy parameter depending on the temperature difference. When the magnitude of thickness parameter χ is small, cross-flow velocity decreases with the velocity index and the opposite effect is observed when the magnitude of χ is large. Originality/value: Directly or indirectly, the importance of the fluid flow which contains 29 nm CuO nanoparticle, water, and gyrotactic microorganisms in the presence of Hall current has been pointed out as an open question in the literature due to its relevance in imaging, ophthalmological and translational medicine informatics. © 2018, Emerald Publishing Limited.

Multidiscipline Modeling in Materials and Structures

Gyrotactic microorganisms and thermoelectric effects on the dynamics of 29 nm CuO-water nanofluid over an upper horizontal surface of paraboloid of revolution

International Journal of Engineering, Science and Technology

Performance of nanofluids on heat transfer in a wavy solar collector

Nanoparticle Heat Transfer and Fluid Flow

Numerical Heat Transfer, Part A: Applications

Unsteady MHD free convection nanofluid flows within a wavy trapezoidal enclosure with viscous and Joule dissipation effects

International Journal of Heat and Mass Transfer

Natural convection in a trapezoidal enclosure filled with carbon nanotube–EG–water nanofluid

Applied Nanoscience

Fluid flow and heat transfer of carbon nanotubes along a flat plate with Navier slip boundary

Time-dependent hydromagnetic free convection nanofluid flows within a wavy trapezoidal enclosure

Journal	Data powered by TypesetApplied Thermal Engineering
Publisher	Data powered by TypesetElsevier BV
ISSN	1359-4311
Open Access	No